Try to measure the CPU temperature during the stuttering. You can use CPU monitor and pull down the upper bar during play to see the temperature. I don't think it's related to this but it's a try.
I played Kirby for Wii at 60 fps without stuttering. I always use 90hz setting. Obviously I guess you tried to modify some emulator options.
Try a different region setting (Pal-Ntsc) or try to redumb your rom.
I played Kirby for Wii at 60 fps without stuttering. I always use 90hz setting. Obviously I guess you tried to modify some emulator options.
Try a different region setting (Pal-Ntsc) or try to redumb your rom.